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Hanoi’s famous “Train Street” is a narrow residential area where active railway tracks run directly through tightly packed homes and cafés. During most of the day, people casually sit beside the tracks drinking coffee, taking photos, chatting, or even drying clothes as if it were a normal street.

But several times a day, everything suddenly changes. Café owners quickly move tables and chairs away, residents step indoors, and visitors press themselves against the walls as a full-sized train slowly passes through the tiny gap - sometimes just inches away from people and buildings.

What makes the place so surreal is how ordinary daily life continues around an active railway line, turning it into one of the most unusual and well-known attractions in Vietnam.

The saola is one of the rarest large mammals on Earth, first discovered by scientists only in 1992 in the forests along the Vietnam–Laos border.

Despite its nickname, it’s not actually related to unicorns it’s a type of bovine (closely related to cattle and antelope). What makes it special is how incredibly elusive it is: scientists have almost never seen one alive in the wild, and there are no confirmed sightings in recent years.

Because of habitat loss and hunting, the saola is considered critically endangered, and its exact population size is still unknown.

It’s wild to think that such a large animal could exist and still remain almost a mystery today.